Hoist



June 24, 1930. c, J, WEBER ET AL HOIST 2 Sheets-Sheet l Original Filed June 29 1926 Clarenced'lleer- June 24, 1930. C J WE'BER ET AL l, 766,157

Original Filed June 29, 1926 2 Sheets-Sheet 2 Patented June 24, 1930 UNITED STATES CLABENCE J. WEBER AND BOY TIONAL IBRIGK COMPANY, or CHICAGO,

A. SEEK, or CHICAGO, ILLINOIS, A

ILLINOIS, ASSIGNORS T0 NA- CORIPORATION OF ILLINOIS Original appllcation fi1ed. 'J'une 29, 1926,

Our invention pertains'in general to trucks or trailers and more particularly to hoisting mechanism therefor of the same general character as that disclosed in our co-pending application, Serial No. 119,312, filed June 29, 1926, of which the present application is divisional. v

In accordance with the general features of our invntiori there is provided a hoist cylinder having a pivotal mounting and. resilient means associated with the mounting comprising a plurality of leaf springs adapted to at all times urge the cylinder into a true vertical position with respect to the chassis of the truck.

In accordance with other features. of our invention, we have provided novel detachable connections between the hoist cylinder and the source 01: hylraulic power, which connections p'ermit of the cylinder being disconnected with facility from the hydraulic pwer unit. I

. In accordance with still other features of our invention, we provide in the connections between the hoist and the pump a three way valve construction for controlling the operation of the hoist. This valve permits of a vibratory movement being imparted to the hoist plunger to cause the same to jar the trailer body and thus cause all of the contents thereof to be quickly discharged. Then, too, the valve may be actuatecl to disconnect the pump from the hoist cylinder and to thus cause the plunger to be maintained in a given stationary position or to cause all of the fluil to be discharged into the tank to lower the hoistplungr2r depending upon the position 0 the valve control member.

Also, we have freni experience found that the cup leather associatecl With the hoist piston tenls to Wear, Out much faster than is usual, due to the fact that it is flexed considerably. We have remedied this condition by positioning the cup leather in a substantially central position Wltll resPect to the pis- Serial No. 119,812. Divded and this application fi1e'd April 18, 1927. Serial NO. 184,468.

ton, and by providing the piston with piston rings on each side of the cup leather. These piston rings serve to confine the cup leather and also to relieve the cup leather of considerable wear by preventing it from being flexed to any considerable extent.

Other objects and advantages of our invention will more fully appear from the ollowing detailed description taken in connection With the aceompanying drawings which illustrate one embodiment thereof and in which,

Fig. 1 is a side elevation of a truck ancl trailer having associategl therewith a hoisting device embodying the fcatures of our invention;

Fig. 2 is an enlarged-view of the hoist cylinder and its pivotal mounting;

Fig. 3 is a sectional view taken on the line 3-3 01. Fig. 2 lo'"oking in the direction indicated by the arrows;

Fig. 4 is a sectional view of our novel hoist 'piston construction; and

Fig. 5 is an enlargedsectional view of the three-way control valve as soc1ated with the pumping mechanism ancl oil tank.

Referring now to the drawings in detail, in which like reference numerals designate similar parts ,throughout the several views, 10 denotes generally a tractor (Fig. 1) which may be of any converltional construction. The tractor 10 is provided. with the usual turn table 11 to which one end of a trailer 12 1s connected. The tractor 10 and. the trailer 12 comprise a truck, such as is Well known in the automotive art. The trailer 12 is equipped with the customary body 13 having one end f pivotally attachecl at 14 to the rear of the trailer 12.

The front end of the body 13 is aclapted to be raised to a position such as that illustrated by dotted lines in Fig. 1.

-The body 13 is adapted to normally test upon the frame 15 of the trailer 12. The rear end. of the frame 15 is provicled with a par of wheels 16 and a pair of springs 17 The front end of the frame 15 is adapted to rest chass1s 18 of the tractor 10. N ormally, the

. annular which front end of the frame will be connected to the said turn table 11 The frame 18 ofthe tractor 10 earries a. pair of gas tanks 19 and 20 which supply the fuel to the power unit of the tractor 10. These gasoline tanks 19 and 20 are positioned immedia tely behind the drivers station 21.

Mounted upon the front end of the trailer frame 15 is a, hoisting device designated' generally by the reference character 25. 'lhis device is ada pted to be utilized to raise the body 13 about its pivot to a. position such as that illustrated by dotted lines in Fig. 1. The

device includes a vertical cylinder 26 end a reciprocable plunger 27 mounted within the cylinder 26. The plunger 27 ispreferably tubular in con'struction andhas associated with its lower end a piston 28.

The piston 28 (Fig. 4) comprises a pair of annular.members 29 and 30 separated by a cup leather 31. The annular member 29 is equipped with a. redced'portion 32 which telescopes the lower end of the tubular plunger 27. The reduced prtion'32 may be fastened to the plunger 27 in any desireble manner. The annular member 29 is also provided with an annular stud 33 which extends through un aperture 34 in the center of the cup le'ather 31 and thro1igh an aperture 35 in the center of the annular member30. The member 30 is preferably equipped with an annular recess 36 in Which a nut 37 is threaded upon the exposed end of the stud 33. his nut 37 serves to draw the members 29 and 30 together end serves to fasten the members and'cup leather rigidly together. The annular member 30 is provided with a reduced portion '38 between the periphery of and the iliner Wall of the cyhnder 26 is located the a1mular rim 39 of'the cup leather 31. In other words, the annular member 30 in reality telescopes the cup leather 31 and thus tends to prevent undue flexing of the cu(p leather. The annular member 29 is provi ed with a piston ring 40 and the annular member 30 is provided The piston rings 40 ner perlpher of the cylinder 26 and serve to relieve the eup leather 31 of some of the strains and stresses imposed thereon when the plunger 27 is actuated. Since the cu leather 31 is confined scoping annular member 30 and the inner with a pistonring 41.

Wall of the cylinder 26 it cannot flex as freely as'in prior piston constructions. This arrangement inereases t e longevity of the cup leathet and insures a reliable service on the part of the piston 28. Heretofore, the cup leather Was caused to be flexed considerably upon the reversal of the direction of movement of the plunger in the cylinder. In our constructiou the cup leather3l cannotthus ex uponthe reversal of the movement of the j ournaled in bearing and 41 engage the inintermediate the teleate the two members 29 and 30.

The upper end of the plunger 27 has fastened thereto a cross arm construction 45 which carries a pair of revolva.ble pulleys 46.

Each pulley 46 is pivotelly attached. to an a.rm 47 pivotally struction 45. Referring bolted to the cross arm connow to Fig. 3, the upper end of -the cylinder 26 is preferably threaded end 'cap5l. The aperture 52 is preferably countersunk as indicated at 53, in order to accommodate a. gland member 54 threaded into the upper part of the cap 50. The gland member 54 is provided with a. central aperture 55 through which the plunger 27 extends.

The lower part of the cylinder 26 is tightly fitted in a pivotally This meinber 56 is provided with a. pa.ir of dianrietrically opposed extensions 57 and 58 brackets 59 and 60. Thus it will be sen that the lower end of the plunger c'ylinder 26 is 'pivotally m'ounted. The bearing brackets 59 and 60 are secured to portions 62 and 63 V means of bolts 65. The portions 62 and 63 are elevated from the 64. The base plate 64 is provided with a pair of flanges 66 end 67 bolted to the cheinnel irons 68 and 69 of the frame 15. The base plungr dueto its being confined intermedi-.

mounted member 56..

of a. base plate 64 by plane of the base plate plate 64 is also equipped with a pair of raised tions is supported a spring construction designated generally by the reference character 70. Since both of the spring constructions are identical, it is believed the description of one Will suffice for both.

Each spring plum1ity of Ieaf springs .74 which vary in length. The springs 74 are held together by means of the usual clip 75. The lorigest lea'f spring 74 abuts the enter wall of the cylinder 26, as indicated at 76. The lower ends of the leaf springs 74 abut the top of the raised portion associated therewith. The springs are bolted to a. lateral extension 78 projecting upwardly from the base plate 64. A clamping plate 79 and a. plurality of bolts and nuts 80 are preferably employed for clamping the spring to the lateral eXtension 78.

N ow it Will be obvious the t the spring construction 70 Will normally function to maintain the hoist cylinder 26 in a vertical position with respect to the base plate 64. However, upon the raising of the body 13 by the plunger27, the cylinder 26 Wi ll begin to tilt about its pivot towards the rear of the trailer 12. This movement Will be resisted by the spring constructioh 70 nearest to the body 13. The degree to which the cylinder constructin 70 comprisesa. o

will pivot about' the axis of its pivotal I body 101 constitutes to this block 91' is a pipe mounting will depend upon the load in the 13. That is to say, the tilting will be proportional to the weight of the load in the truck body 13.

Each pulley 46 has passing over its groove a cable 80, one end of which is fastened to a channel beam 81 of the body 13 and the other end of which is fastened to an eyelet 82 secured to the base plate 64. The paia of cables 80 are util ized upon the raisi'ng of the pulleys 46 by theplunger 27 to raise the associated. end of the body 13.

Associated with the cylinder 26 intermediate its ends is a ring of metallic mat'erial 90. This ring may be secured to the outer wall of the casing or cylinder 26 by any suitable means. This ring 90 constitutes a support for the flexibl connections to behereinafter described. Fastened to this band 90 is a tubular block 91 (Fig. 2) into which one end o a rigid pipe line 92 discharges. The other end of the pipe line 92 is connected to an outlet in the cylinder w-all 26, designated by the reference haracter 93. The pipe line 92 may be provided with a union 94 intermediate its ends to facilitate the disconnecting of the pipe line from the cylinder 26 whenever it is desired. Also secured to the ring 90 is a tubular block 91 which is identical in construction to the block 91. Connected line 95, the lovver end of which communicates with an inlet 96 for the cylirider 26. The pipe line 95 is also equipped with a union 97 positioned intermediate its ends. Since both the blocks 91 and 91' are identical in construction, it isbelieved a description of one will suflice for both. Each block 91 is provided with a lateral projection 98 having a tapered otifice portion 99. The projection 98 is tubular in construction and communicates with the pipe line associated with the block.

Associated with the projections 98 of the blocks 91 and 91' are a pair of flexible lines 100 and 101. The line 100 constit-utes the inlet lead for the hoisting device and the line the outlet for the hoisting (le-vice. Each of these lines has an end provided with a metallic ring oi': material 102 to which is pivotally attached a yoke member 103 for straddling the associated projection 98. The yoke member 103 has an adjustable screw 104 adapted to be moved into engagement with the top of the corresponding proj ection.98. The tapered portion 99 of the projection is adapted to be inserted into the end of the pipeline and the pipe line is adapted to be tightly held in place on the proj ection by means of the yoke and the associated screw 104. j

It should of course be understood that the inlet pipe line 100 is associated with the block 91' communicating with the inlet pipe 95 and that the pipe line 101 is associated matically in Fig. 5 a

er 27 jars the body 13 with the block 91 eommunicating with the outlet 93. The detachable connections, including the yoke members 103 previously described,'enable the pipe lines 100 and 101 to be detached from the hoist cylinder 26 with facility. This is particularly advantageous when it is desired to disconnect the trailer from the tractor.

Referring now to Fig. 1, it Will be observed that the inlet pipe line 100 communicates. with a three-vvay valve 105. The flexible pipe connection 101 has its other end connectedto a pipe 106 discharging into an oil tank 107. The upper end of the pipe 106 communicates with the three-way valve 105. The threeway valve is also connected by a flexible connection 107 to a pumping mechanism, designated generally by the reference numeral 108.

Thepumping nicchanism is connected by a pipe line 109 to the b0tl0ll'lof the oil tank The oil tank 107 and the pumping mechanism 108 are preferably disposed intermediate the two gas tanks 19 and 20, previously described.

We. have illustrated somewhat diagramthree-way valve construction 105 for controlling the opeiation of our hoist. The valve proper includes a T body 111, a valve member 112 and a handle 110 connected to the valve member 112 for L actuating the same. The valve member 112 is adapted to be utilized to close any one of the three ports of the valve. Port 113 communicates witli the pipe communicates to the oil tank 107 through the pipe line 106, and port 115 communicates to the pump mechanism 108 through the pipeline 107 It Will be obvious from the valve member 112 is in trated, the pump to the hoisting cyli1ider 26. After the plunger 27 has been moved to its uppermost position, the oil entering che c'ylinder 26 from the pump will cause the 'plunger 27 to vibrate. vibratory movement on the part of the plun'gand enables all of the contents to be discharged therefrom quikly. Now, by operating the handle 110 to cause the valve member 112 to close the port 115, the pumping mechanism 108 Will be disconnected from the three-way valve 105. This will result in the plunger 27 forcing the oil out of the cylinder 26 through the pipe line 95, through 100, port 113, into the port 114- and into the tank 10 In other words, when the port 115 is closed, the plunger 27 will be moved to it s lowermost position.

On the other band, when the pori: 113 is closed, the plunger 27 will not oscillate,but, on the contr'ary, Will remain at a given raised position. The oil pumped through the line 107 by the pump 108 will be by-passed by the valve 105 into the tank 107. Thus it will be seen thai; through the three-way valve 105 line 100, port 114.

will be forcing fluid or oil hoist cylinder,

liquid may be either pumped to the hoist, bypassed to the tank, or th oil in the cylinder 26 may be caused to be discharged into the tank 107 by the hoist plunger 27.

Wedesire it understood that although we have described in detail the preferred embodiment of our invention, theinvention is not to be limited thereby, but only in so far as defined by the scope and spirit of the-appended claims. We claim:- i 1. In combination, in a hoisting device, a a reciprocable plunger in the said cylinder, a fluid tank associated with the said cylinder, a pump for pumping fluidfrom the tank to the cylinder to raise the plunger therein, a pipe line between the said pump and the lower part of the cylixider, a pipe line for an overflow between the upper part of the cylinder and the tank, a pipe connection between the said pipe lines, the pipe line between the pump and the lower part-ofthe cylinder being adapted to supply fluid for operating the plunger independently of the pipe line from the top of the cylinder, and a control valve associated with the said connection for contilling the raising and lowering of the plunger within the cy'linder, said valve when in one position senving to cause the fluid coniing from the pump to vibrate the said plunger, and when in another position servingto cause the plunger to be maintained stationary in a g1ven elevated position.

valv to the h'oist cylinder, the pipe line leading from the pump to the valve with the line delivering from the valve to t he tank, or the line leading frena the valve to the hoist cylinder with the line leadi1ig from the valve tg the tank.

4. In combination, rocable plunger in said cylinder, associated with said cylinder, pumping fluid from the'tank to the cylinder to ra1se the plunger therein, a control valve, a pipe line from said pump through said valve to the lower part of the cylinder, a pipe line between said valve and tank, said valve controllihg the raising and lowering of'the plungen within the cylinder, in one position cooperating pipe line from the top of the cylinder to the tank causing the raised plunger to vibrate, and when in another posit1on serving to main tain the plun er stationary in a predeterminedelevate position. I

In witness whereof, We hereunto snbscribe our names this 12 day of April 1927.

CLARENCE J. WEBER.

a hoist cylinder,a recip a fluid tank BOY A. SEEK.

2. In combination, in a hoisting device,

a hoist cylinder, a reciprocable plunger in the said cylinder, a fluid tank assocmted with the said cylinder, a pump for pumpin'g fluid from the tank to the cylinder to raise the plunger 7 valve with the pipe line therein, a pipeline between-the said pump and cylinder, a pipeline for the lower part of the an ovegflo'w between the. upper part of the cylinder and the tank, a control valve, a pipe connec'tion between the said pipe lines, control valve and tank, the pipeline between the pump and the lower part of the cylinder being adapted to supply fluid for operating the lunger independently of the pipe line frena t etop.of the cyli'nder, s&id valve being adated for regulating'the raising and lowering of the plunger within said hoist cylinden 3. In a hoisting deVice, a hist c}ylinder,l ,aconpipe line deliverin'g'from a plunger operable therein, a fluid tan trol valve, a pump, a the pump to said valve, a pipe line-deliverin from the valve to the bottom of the cylinder for rasing said plunger, a pipe line fon anoverflow delivering from the to 01 the cylinder back to the tank inde'pen ently of the fluid spply-line from the pump to the bot tam 'of the cylinder, a pipe line delivering from the valve to the tank, and a pipe line delive'1ing from the tank to the pump, said valve being operablete selectively connect the pipeline delivering from the pump to the delivering from the the valve when with an over,flow

a plimp for 

